Just one question.....err......why?
Some people use motorcycles to go places.
It is handy for navigation using Google maps or some other navigation software.
I have been looking for a good sturdy mount. Having to memorize a route fully before setting of is getting old.
Phones come with earphones.
If you using google maps there is someone inside the phone who shouts the directions at you just in case you too busy looking at the road to look at the screen

The person inside the phone shouts so loud that it goes through the wires and into your ear, so all you have to do is turn left when they tell you to.

I joke around but honestly that is what I do.. punch in the address and put the phone in my pocket or backpack with one earphone in my ear.. follow the directions and OLE.. done.